Add Button in Tab of JTabbedPane

There are lots of things we can do in the desktop application using java's swing technology. One of  which here is adding a button to the Tab for some help user to closing the tab, etc. This kind of example can help to build some application having facility for multiple infinite tab like Browser application, or a kind of text editor, etc.

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JToolBar;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;

public class AddButtonToTabBar extends JFrame {
private JTabbedPane tp;
private int tabCounter = 0;

public AddButtonToTabBar() {
super("Editor");
setDefaultCloseOperation(EXIT_ON_CLOSE);

JToolBar jtb = new JToolBar();
JButton btnAdd = new JButton("Add Tab");
ActionListener addTabl = new ActionListener() {
 public void actionPerformed(ActionEvent e) {
addTab();
 }
};
btnAdd.addActionListener(addTabl);
jtb.add(btnAdd);

JPanel pnlURL = new JPanel();
tp = new JTabbedPane();
addTab();
getContentPane().add(jtb, BorderLayout.NORTH);
getContentPane().add(tp, BorderLayout.CENTER);

setSize(700, 700);
setVisible(true);
}

void addTab() {
// A Simple Text editor
JEditorPane ep = new JEditorPane();
ep.setEditable(true);
tp.addTab("Tab - " + tabCounter, new JScrollPane(ep));

//Preparing a button to add 
JButton tabCloseButton = new JButton("X");
tabCloseButton.setActionCommand("" + tabCounter);

//ActionListener for what to do when the button is clicked, here is to close the particular tab
ActionListener al = new ActionListener() {
public void actionPerformed(ActionEvent ae) {
JButton btn = (JButton) ae.getSource(); // It will get the button object which is clicked
String s1 = btn.getActionCommand();
for (int i = 1; i < tp.getTabCount(); i++) {
JPanel pnl = (JPanel) tp.getTabComponentAt(i); // It will return the whole component which we had set in the Tab

// It will get the button component. The parameter for the getComponent 
// is index of the total number of component. Here 1 means the button and 0 means the lable.
btn = (JButton) pnl.getComponent(1);
String s2 = btn.getActionCommand();
if (s1.equals(s2)) {
tp.removeTabAt(i);
break;
}
}
}
};
tabCloseButton.addActionListener(al);

// This condition is to make at least one tab to be in the application.
if (tabCounter != 0) {
JPanel pnl = new JPanel();
pnl.setOpaque(false);
pnl.add(new JLabel("Tab - "+tabCounter));
pnl.add(tabCloseButton);
tp.setTabComponentAt(tp.getTabCount() - 1, pnl);
tp.setSelectedIndex(tp.getTabCount() - 1);
}
tabCounter++;
}

public static void main(String[] args) {
new AddButtonToTabBar();

}
}

Write the above program, save it as AddButtonToTabBar.java , compile it and run it.